Can supply the lightdm log but it appears to not log anything during the log out hang. Here is a journalctl -f >> file
Started it, then attempted log out, waited about 10 sec or so, then went to tty3 to reboot.https://paste.ubuntu.com/p/6hFYcKbVKn/

I installed the current daily 19.04 ISO in a a partition. Then I installed ubuntu-unity-desktop from the repos. Everything seems to work OK currently, except logging out to the greeter as commented by other posts.

These 5 should be fine. But you should really wait until repo version updated.

I’ve already installed those 5.
About Nemo, I’ve checked the latest Budgie, where Nemo is the one Ubuntu repo has, 3.8.5. It looks OK, but Nemo had moved to 4.06 at the original place, so would such Nemo be provided for Unity? @fossfreedom too